:about the place you were talking about i find it, its Kasol its approx 10km north west of malana village, am i right ?
In oct.- nov. you'll likely fall over fresh charras, in jan, the best will be gone as it's sold completely in oct. There is no reason to keep some srash for torists who are late.
In april it's still nice and it's not as cloudy as after the mosoon.
But let me tell you it's still hard to find best quality.